CNW 4103, model GP7, built 12/51, builder number 15193, acquired by C&NW in 1/81, previous road number RI 4428, C&NW paint scheme OY ["Old Yellow," pre-1981 with Railroad Roman numerals (i.e. Stagecoach yellow)], renumber planned to UP 403. [Source: The Final North Western Motive Power Roster. Courtesy of The Run of the Ge's, The Chicago & North Western Historical Society, Library of Congress catalog card number 95-83545, 1995, page 57.]

C&NW 4103 was built in December 1951, GM EMD GP7R, builder number 15193, as Chicago Rock Island & Pacific 1234, later numbered as Chicago Rock Island & Pacific 4428. Purchased by Precision National Corporation, Mr. Vernon, Illinois, in 1974 or 1975, rebuilt in 1957 or 1976 for Precision National Corporation, and leased back to Chicago Rock Island & Pacific. Returned to Precision National Corporation after Chicago Rock Island & Pacific shut down in April 1980 and leased to C&NW, entering service in 1981. [courtesy of Union Pacific Locomotive Directory, Don Strack, Withers Publishing, ISBN 1-881411-16-8, 1998]

CNW 4103 GP7, status is unknown, built in December 1951, serial number 15193, frame number 5151-10, order number 5151, ownership history ( CRIP 1234, CRIP 4428, CNW 4103 ). [Courtesy of the RAILSPOT Engine History Database, November 1999]